diavase ti leei min vlepeis mono tis eikones..:P
Do right click on your pack and go to ---> Team--->Apply patch
Now go to your notepad and copy the code of the patch
The in eclipse check the clipboard option and press next
Then again next.Now you will see if the patch will have any error , if not press finish.
Open the patch Find the place that need's to be copied and copy thelines with + and delete lines with - .
Now you installed a mod!!!!
Go now to the file Build(in workspace) and press Run as --->Ant Build
Got to your workspace in the build folder and you have your pack with your mode.
etc etc.